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authorJarod Wilson <jwilson@redhat.com>2008-03-25 16:47:16 -0400
committerStefan Richter <stefanr@s5r6.in-berlin.de>2008-03-27 21:01:14 +0100
commit6b84236d37ef602d1e4f52b27162c20394e83359 (patch)
tree0e383a32e66f7866fb5ac574acfa408b59e2d8cf /drivers/firewire
parent05dda977f2574c3341abef9b74c27d2b362e1e3a (diff)
firewire: fw-ohci: plug dma memory leak in AR handler
There's an ugly little memory leak in firewire-ohci's ar_context_tasklet(), where we're not freeing up some of the memory we use for each ar_buffer, due to a moving pointer. The problem has been there for a while, but didn't get noticed until after converting the AR routines over to use coherent DMA and I started running into I/O stall- outs with the following message output repeatedly to the console: PCI-DMA: Out of IOMMU space for 53248 bytes at device 0000:04:09.0 Plugging this leak is definitely necessary, but unfortunately, isn't the entire answer to my problem, it only increases the amount of I/O that I can do before hitting the problem. Still working on tracking down the root cause.. Signed-off-by: Jarod Wilson <jwilson@redhat.com> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire')
-rw-r--r--drivers/firewire/fw-ohci.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index 996d61f0d46..ca6d51efd8b 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -401,7 +401,8 @@ static void ar_context_tasklet(unsigned long data)
if (d->res_count == 0) {
size_t size, rest, offset;
- dma_addr_t buffer_bus;
+ dma_addr_t start_bus;
+ void *start;
/*
* This descriptor is finished and we may have a
@@ -410,9 +411,9 @@ static void ar_context_tasklet(unsigned long data)
*/
offset = offsetof(struct ar_buffer, data);
- buffer_bus = le32_to_cpu(ab->descriptor.data_address) - offset;
+ start = buffer = ab;
+ start_bus = le32_to_cpu(ab->descriptor.data_address) - offset;
- buffer = ab;
ab = ab->next;
d = &ab->descriptor;
size = buffer + PAGE_SIZE - ctx->pointer;
@@ -427,7 +428,7 @@ static void ar_context_tasklet(unsigned long data)
buffer = handle_ar_packet(ctx, buffer);
dma_free_coherent(ohci->card.device, PAGE_SIZE,
- buffer, buffer_bus);
+ start, start_bus);
ar_context_add_page(ctx);
} else {
buffer = ctx->pointer;